Nokia flip phone it is then lol
The new flip phones run Googled Android, and even if it don't, if they have Bluetooth and/or hot spot the Google and iPhones will detect them and report your location to Big Tech
Hmm, maybe just having your family all have satellite phones then? Honestly it seems like you basically have to take yourself back to the stone age to enjoy the privacy that people in the 80s used to enjoy
Some Linux phones have physical switches for bluetooth, wifi and cell modems.